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The progression is any number in the pattern x 3 + 1

1 x 3 + 1 = 4

4 x 3 + 1 = 13

13 X 3 + 1 = 40

40 X 3 + 1 = 121

121 x 3 + 1 = 364.......which is the next number in the pattern. See? Easy as pi; which is:3.14159265...

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14y ago

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